Version 0.7.1 (2007.02.08):
	* added a button 'err' (error) on the first tab
	* the input edit can have 2048 characters now
	* added remembering the vertical size into the config file
	* fixed a problem with the 'tab' key
	* added a message 'Calculating...' when an user clicks on the 'err' button during calculating something